nippy file

It seems like you might be asking about a "nippy" file, but the term "nippy" is not standard in computing or file formats. It may also be a typographical error. If you're referring to a specific type of file or application (like "nippy" as a slang for something quick or efficient), please provide more context or clarify your request. For instance, are you looking for a particular file format, software, or a function related to file handling? That way, I can assist you better!